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Characterisation Method Information
Characterisation Method Name:
Forest land for roads and other hard-made surface use impact on NEX
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: equivalency method using forestry as a reference
Method Description:
NEX is Normalised EXtinction of species.


Model
The characterisation factor is determined by an equivalency method using forestry as a
reference.

Equivalency factor

There are no direct estimations available for the impact on bio-diversity from hard-making of surfaces. Roads have not only an impact through covering a surface. It also
contributes to fragmentation of habitats. To some degree, there is also a positive effect on bio-diversity from building of roads. Roadsides are often rich in species. Due to lack of better estimates, the impact on bio diversity from hard-making of forestland is assumed to be at the upper range of the impact distribution from forestry, i.e. ten times the average.

Calculation of characterisation factor

The characterisation factor is thus 10*5.0E-15 =5.0E-14 NEX/m 2 year
Literature Reference:
Steen B (1999b): A systematic approach to environmental priority strategies in product development (EPS). Version 2000 Models and data of the default method CPM report Chalmers University of Technology Sweden
Methodological Range:
The system is global, but limited to arable land. The time frame is 1990.
Notes:

Existing Characterisation Factors of Forest land for roads and other hard-made surface use impact on NEX
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor NEX EPS/2000
Type = Natural resource
Direction = Input
Media = *
Geography = *
Hardmaking of forest land EPS/2000 5E-14 NEX/m2 year